This may become spam/rage thread, but I'm wondering about the collective LD experience in contrast to my personal ones.

I know perfecting shield cancel involves timing and skill.

However, when I'm spectating matches, it seems like some people are able to consistently shield cancel faster with no ASI than other people who have significant ASI (using the same weapon ofc).
For example, some people are capable of dual-switching flourishes at an astounding rate, even without ASI. The sword blade doesn't even fully extend before it is retracted and the next swing executes. However, other people who are equally skilled at shield canceling cannot seem to go as fast.
I've tested this difference in Lockdown matches I am part of. When I try it (alone as practice) with asi low on both picks, starting at slow speeds and gradually getting faster, the game eventually forces me to combo at a certain frequency. However, in the same game, someone else with non-ASI picks can surpass my limit frequency.

Is there a physical limit (independent of skill) that affects how fast someone can perform consecutive attacks?
It doesn't make sense for latency, since that should create an overall delay instead of a delay between consecutive actions.